Rotary pump.



PATENTED MAY 7 1907. W. J. 5; W, A. LBDDELL.

ROTARY PUMP.

APPLIUATION FILED MAR. 8, 1905.

2 SHEETSSHEET 1.

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PATENTED MAY 7, 1907. W. J. & W. A. LEDDBLL.

PUMP. I

ED MAR.8.1905.

ROTARY WITNESSES:

M flu UNITED STATES ATENT OFFICE.

WILLIAM J. LEDDELL AND WILLIIXM A. LEDDELL, OF SUMMIT, NEW JERSEY.

ROTARY PUMP.

Specification of Letters Patent.

Patented May 7, 1907.

Application filed March 8,1905. Serial No. 248,998.

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Be it known that we, NILLLAM J. LED- DELL and WILLIAM A. LEDDELL, both citi- Zens of the United States, and residents of Summit, in the county of Union and State of New Jersey, have jointly invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

This invention aims to provide an improved rotary pump of the type employing an inner and an outer drum, one eccentrically arranged relatively to the other, and vanes extending across a space between the two.

The invention provides improvements in the arrangement and mounting of the vanes, in the arrangement of the valves, and in certain other features referred to hereinafter in detail.

The accompanying drawings illustrate an embodiment of the invention.

Figure 1 is a longitudinal section approximately on the line 1-1 of Fig. 2; Fig. 2 is a cross-section on the line 2-2 of Fig. 1; Fig. 3 is an elevation looking at the right hand side of Fig. 1; Fig. 4 is a cross-section of the inlet valve; Fig. 5 is a face view thereof.

An improved feature of the invention is the pivoting of the vanes so that they rotate about the same axis as the outer cylinder or drum, and always extend radially or normally to the inner face of the outer drum, 1

thus avoiding the rocking of the edges of the vanes against the face of the outer drum, which has been found to produce considerable wear, and to necessitate special means in avoiding leakage in previous constructions.

Referring to the embodiment illustrated, A is the outer and B is the inner drum, heads or ends C being provided preferablyattached to the ring constituting the outer drum. The outer drum is preferably formed with wings or ribs D to expose a considerable surface to the outer air and thus cool the apparatus. A driven shaft E has shrunk on it the hub F of the inner drum, and the latter through suit able connections rotates the outer drum. Standards G and H carry the bearings for the shaft E and for the ends C of the outerdrum. Preferably Babbitt bearings J and K are provided to insure easy running and to permit taking up wear from time to time. Or stuff ing boxes J may be used.

A circular extension L projects inward from one of the ends of the outer drum, and upon this are mounted slip rings M, M and M carrying the several vanes N, N and N The inner drum B is provided with a series of slots 0 through which the vanes N pass, and to permit of angular movement of the inner drum relatively to the vanes the slots are made flarr on the inner side, and a tight joint is insured by providing a pair of half round blocks 1? fitting in suitable recesses in the slots 0.

Supposing the shaftto rotate in the direction of the arrow shown in Fig.2, it will be seen that the spaces Q between the drums are reduced to a minimum at the top, whence they are gradually enlarged to their largest size at the bottom, and then again reduced to the smallest size. Inlet valves R are provided at one end through which the fluid is sucked as the spaces are enlarged, and outlet valves S through which the fluid is forced out as the spaces are reduced. The inlet valves where water or other fluid other than the atmosphere is to be pumped, may be connected to a stationary pipe through the bearings. For an air pump, they may be arranged as shown in the drawings without special connection to a fixed inlet. The outlet valves 18 connect through passages T with a chamber U formed in the bearing at that side of the apparatus, and thence out through a fixed pointat which any suitable connection may be made.

The details of the valves are not important, any suitable check-valves being used.

For transmitting the movement of the inner cylinder to the outer cylinder, Ipreferably provide a series of rin s W, the angular positions of which are indicated in dotted lines in Fig. 3, and which may be cast or otherwiselocated on the inner face of the end 0 of the outer drum. Cooperatingwith the rings 'W are a series of pins X. on an adj acent face of the inner drum. This construction has special advantages in facilitating the erection of the apparatus, no permanent connection being necessary between the two drums. It is only necessary to insert the inner drum within the outer one endwise in such an angular position that the ins X enter the rings W, or if not assemb ed, to apply directly the end 0 having the rings, positioning the rings so that they will engage the pins. This driving connection also gives a very smooth running. The inner drum is alwayspushing and never pulling the outer drum around, and therefore there is no lost motion even after the pins or rings are considerably worn.

Preferably in order to direct the air axially into the pump, the inlet valves R are provided with hoods Y (Figs. 4 and '5) open in the direction of rotation, and adapted to deflect the air into the inlet valves. I

Though We have described with great particularity of detail a certain specific embodiment of the invention, yet it is not to be understood that the invention is limited tothe particular apparatus described.

Various modifications thereof may be made. in detail, and the arrangement and combination of the parts, by those skilled in -inner.and outer the art, Without departing from the invention.

What we claim is A rotary pum including in combination dirums B and Aeccentrically arranged relatively to each other, vanes N extending across the space between the pins X upon the inner drum and Within said rin s.

I n 'witness whereof, We have hereunto signed our names in the presence of two subscribing Witnesses.

WILLIAM J. LEDDELL. WILLIAM A. LEDDELL.

Witnesses DOMINGO A. UsINA, THEODORE T. SNELL. 

